I was almost killed by a fish. This was about 40 years ago.
I was surfing in Galveston, and just sitting up on the surfboard out by the end of a jetty one day, when a jumping fish slammed into the side of my face. This was a fish that weighed a few pounds, and felt like someone punched me with a heavyweight jab, and I felt slightly woozy. I realized I almost was knocked cold, and since I was out in the muddy Gulf of Mexico, that wouldn't have been a good place to get knocked out, and an inelegant way to go down for the count, although somewhat out of the ordinary.